<template>
  <div>
    <div class="search">
      <input class="search-input" type="text" placeholder="输入城市名或拼音" v-model="keyword"/>
    </div>
    <div class="search-content" ref="search" v-show='keyword'><!--输入框有数据的时候出现 -->
      <ul>
        <li 
        class="serach-item border-bottom"
        v-for="item of list" 
        :key="item.id"
        @click="handleCityClick(item.name)"
        >{{item.name}}</li>
        <li class="serach-item border-bottom" v-show="isNoData">没有找到匹配数据</li>
      </ul>
    </div>
  </div>
</template>

<script>
import {mapMutations} from 'vuex'
import Bscroll from 'better-scroll'
export default {
  name: 'CitySearch',
  props: {
    cities: Object
  },
  data () {
    return {
      keyword: '',
      list: [],
      timer: null
    }
  },
  methods: {
    handleCityClick (city) {
      // this.$store.dispatch('changeCity', city)
      // alert(city)
      //this.$store.commit('MchangeCity', city)
      this.MchangeCity(city)
      this.$router.push('/')
       // 想要通过actions调用方法必须使用dispatch 或者 跳过actions直接通过commit来调用Mutations
      // this.$router.push('/') // 选择后跳转到主页 实现联动 用了vue-router的编程跳转链接
    },
    ...mapMutations(['MchangeCity'])
  },
  computed: {
    isNoData (){
      return !this.list.length//如果输入框为空的时候显示
    }
  },
  watch: {
    keyword () {
      if(this.timer){
        clearTimeout(this.timer)
      }
      if(!this.keyword){ //如果输入框为空,给list空数组,就不会创建li,并且结束
        this.list = []
        return
      }
      this.timer = setTimeout(() => {
        const result = [] //创建一个空数组
        for(let i in this.cities){//循环遍历cities
          this.cities[i].forEach((value) =>{//遍历cities下的数据,判断value的值是否对应keyword的数据,如果对应将数据加到数组中
            if(value.spell.indexOf(this.keyword.toLowerCase())>-1 || value.name.indexOf(this.keyword)>-1){
              result.push(value)
            }
          })
        }
        this.list = result
      },100) 
    }
  },
  mounted (){
    this.scroll = new Bscroll(this.$refs.search)
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
    .search
      padding: 0 .1rem
      height: .72rem
      background-color: $bgColor
      .search-input
        box-sizing: border-box
        width: 100%
        height: .62rem
        padding: 0 .1rem
        line-height: .62rem
        text-align: center
        border-radius: .06rem
        color: #666
    .search-content
      overflow: hidden
      position: absolute
      z-index: 1
      top: 1.58rem
      left: 0
      right: 0
      bottom: 0
      background-color: #eee
      .serach-item
        line-height: .62rem
        padding-left: .2rem
        color: #666
        background-color: #fff
</style>
